:root {
  --bg: #f4f7f8;
  --card: #ffffff;
  --text: #102027;
  --primary: #1f6f8b;
  --error: #8a1c1c;
  --border: #d8e1e5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #edf4f7 0%, #f8fbfc 100%);
  color: var(--text);
}

.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem 2rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 8px 20px rgba(16, 32, 39, 0.08);
}

h1 {
  margin-top: 0;
}

h2 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-weight: 600;
}

.full-width {
  grid-column: 1 / -1;
}

input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.7rem;
  font-size: 0.95rem;
}

button,
.button-link {
  display: inline-block;
  margin-top: 1.25rem;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
}

.error {
  color: var(--error);
  font-size: 0.85rem;
}

.error-box {
  border: 1px solid #f1b2b2;
  background: #fff3f3;
  color: var(--error);
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  margin: 0.75rem 0;
}

.checkbox {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.hint {
  color: #3e565e;
  margin-top: 0;
}

.child-row {
  margin: 0.75rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
}

.children-rows {
  display: block;
}

.secondary-button {
  background: #eff5f7;
  color: #0f4253;
  border: 1px solid #b5c9d1;
}

.remove-child-button {
  margin-top: 0.75rem;
  background: #f7eded;
  color: #7b2121;
  border: 1px solid #d6b5b5;
}

.remove-child-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@media (max-width: 700px) {
  .grid {
    grid-template-columns: 1fr;
  }
}